Electronic surveillance system employing the doppler effect

Details Electronic surveillance system employing the doppler effect Electronic surveillance system employing the doppler effect

G - Physics

08

B

343/17

G08B 13/14 (2006.01) G01S 13/56 (2006.01) G01S 13/74 (2006.01) G08B 13/22 (2006.01) G08B 13/24 (2006.01)

Patent

CA 1240772

Abstract of the Disclosure A coherent frequency, velocity responsive elec- tronic surveillance system detects the motion of a trans- ponder relative to two receiving antennas on opposite ends of a surveillance zone positioned at the exit of a retail store. Motion in opposite directions relative to the two antennas indicates that the transponder is within the surveillance zone. As a means of reducing false alarms, motion of a transponder proximate to, but outside the zone is distinguished from motion inside the zone because motion outside the zone is in the same direction relative to both antennas. False alarms are reduced even further by re- quiring detection of motion through a selected distance before indicating an alarm.

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